iMac Intel 27" EMC 2309 and 2374

iMac Intel 27". EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz), EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz)

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Blank screen. With new ssd

Installed new sad to my new 2013 iMac. When I power up the screen is blank as in black. When back in the original hdd it works fine. Is there something I'm missing?

Answer this question I have this problem too

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Of course you formatted and installed the OS on the new drive. Could you be using a SATA III (6Gb/s) drive on your machine thats built for SATA II (3Gb/s), Some of the new drives, although calming backward compatibility, are giving users problems that trace back to having to be manually jumpered to the lower speed.

You might need to do an EFI update while the old drive is installed.

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John will be eternally grateful.

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